GALLERY: David Letterman and Other Stellar Beards

Iconic late night talk show host/comedian David Letterman celebrates his birthday today (April 11), and while he's laid low since retiring from The Late Show desk, there's one noticeable difference whenever he makes a public appearance: That massive beard!

(Seriously, that thing is something else.)

In honor of Letterman, we gathered photos of some of our other favorite beards in entertainment in recent memory.